CIR90A 95mm Flat Face Domed Button DTH Drill Bit The CIR90A 95mm Flat Face Domed Button DTH Drill Bit is designed for down-the-hole rock drilling applications requiring reliable performance, stable drilling and effective rock fragmentation. Featuring a 95mm bit diameter, flat face geometry and domed or spherical tungsten carbide buttons, this DTH button bit provides a balanced cutting structure for a wide range of rock drilling conditions. The carbide button configuration